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  1. #1
    Wheelsuck Fat Boy's Avatar
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    Jun 2007
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    Road Shifter / MTB derailleur mix and match question

    OK, so I'm looking at buying a folder with road components on it. It has an 11-23 cassette. I would probably want to put a cassette on it with a wider range.

    So, here's the question. If I go with an 11-32 or 34 cassette, I have to go with a mountain bike rear derailleur (Say, an XT) because a road derailleur will only accept a biggest rear cog of 27 teeth. Will the XT rear derailleur work with Ultegra shifters? The real question, I guess, is if they have the same gear spacing and if they do, do the shifters and derailleurs have the same actuation ratios?

    I know this is kind of a weird question to pose, but I know from riding my DT that a 53-32 combination is marginal for really steep hills, but I like the taller gearing in the flats.

    So does anyone know if I can have my cake and eat it too?


  2. #2
    Part-time epistemologist invisiblehand's Avatar
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    Jun 2005
    Washington, DC
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    Jamis Nova, Bike Friday NWT, STRIDA, Austro Daimler Vent Noir, Haluzak Horizon, Salsa La Raza, Hollands Tourer, Bike Friday tikit
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    Assuming that the road and mtb cassettes have the same number of sprockets--probably 9--then you can use the same shifter for both of them. Turns out that sometimes a road derailer can accomodate a 11-32 (and almost always a 30t max sprocket). Typically, you need to adjust the B-screw to fit the bigger cassette.

    Check out Sheldon Brown's page for more details.


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